linux-kernel - Re: [PATCH v2 1/4] kernel.h: drop STACK

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Message-ID: <74dae26a-ef75-48e7-a391-47152365e39c@kernel.org>
Date: Thu, 4 Dec 2025 08:43:05 +0100
From: "Christophe Leroy (CS GROUP)" <chleroy@...nel.org>
To: "Yury Norov (NVIDIA)" <yury.norov@...il.com>,
 Steven Rostedt <rostedt@...dmis.org>, Masami Hiramatsu
 <mhiramat@...nel.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 Randy Dunlap <rdunlap@...radead.org>, Ingo Molnar <mingo@...nel.org>,
 Jani Nikula <jani.nikula@...ux.intel.com>,
 Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
 David Laight <david.laight@...box.com>, Petr Pavlu <petr.pavlu@...e.com>,
 Andi Shyti <andi.shyti@...nel.org>, Rodrigo Vivi <rodrigo.vivi@...el.com>,
 Tvrtko Ursulin <tursulin@...ulin.net>, Daniel Gomez <da.gomez@...nel.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 "Rafael J. Wysocki" <rafael@...nel.org>, Danilo Krummrich <dakr@...nel.org>,
 Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org,
 intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
 linux-modules@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Cc: Jani Nikula <jani.nikula@...el.com>
Subject: Re: [PATCH v2 1/4] kernel.h: drop STACK_MAGIC macro

Le 03/12/2025 à 17:23, Yury Norov (NVIDIA) a écrit :
> The macro was introduced in 1994, v1.0.4, for stacks protection. Since
> that, people found better ways to protect stacks, and now the macro is
> only used by i915 selftests. Move it to a local header and drop from
> the kernel.h.
> 
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Acked-by: Randy Dunlap <rdunlap@...radead.org>
> Acked-by: Jani Nikula <jani.nikula@...el.com>
> Signed-off-by: Yury Norov (NVIDIA) <yury.norov@...il.com>

Reviewed-by: Christophe Leroy (CS GROUP) <chleroy@...nel.org>

> ---
>   drivers/gpu/drm/i915/gt/selftest_ring_submission.c | 1 +
>   drivers/gpu/drm/i915/i915_selftest.h               | 2 ++
>   include/linux/kernel.h                             | 2 --
>   3 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gt/selftest_ring_submission.c b/drivers/gpu/drm/i915/gt/selftest_ring_submission.c
> index 87ceb0f374b6..600333ae6c8c 100644
> --- a/drivers/gpu/drm/i915/gt/selftest_ring_submission.c
> +++ b/drivers/gpu/drm/i915/gt/selftest_ring_submission.c
> @@ -3,6 +3,7 @@
>    * Copyright © 2020 Intel Corporation
>    */
>   
> +#include "i915_selftest.h"
>   #include "intel_engine_pm.h"
>   #include "selftests/igt_flush_test.h"
>   
> diff --git a/drivers/gpu/drm/i915/i915_selftest.h b/drivers/gpu/drm/i915/i915_selftest.h
> index bdf3e22c0a34..72922028f4ba 100644
> --- a/drivers/gpu/drm/i915/i915_selftest.h
> +++ b/drivers/gpu/drm/i915/i915_selftest.h
> @@ -26,6 +26,8 @@
>   
>   #include <linux/types.h>
>   
> +#define STACK_MAGIC	0xdeadbeef
> +
>   struct pci_dev;
>   struct drm_i915_private;
>   
> diff --git a/include/linux/kernel.h b/include/linux/kernel.h
> index 5b46924fdff5..61d63c57bc2d 100644
> --- a/include/linux/kernel.h
> +++ b/include/linux/kernel.h
> @@ -40,8 +40,6 @@
>   
>   #include <uapi/linux/kernel.h>
>   
> -#define STACK_MAGIC	0xdeadbeef
> -
>   struct completion;
>   struct user;
>